Mixtures and Separation Methods
•
A mixture is a
combination of
ingredients.
•
The individual
ingredients in a
mixture are not
permanently
changed.
•
They are just
mixed together.
•
They can be
separated again.
Mixtures
•
The method of
separation will depend
on the size of the
ingredients or particles
in the mixture.
•
We can separate some
mixtures by sieving or
filtering.
•
If the mixture is a
solution, we can
separate it using
evaporation.
Separating mixtures
•
Magnets can
also be used to
separate some
mixtures.
•
Huge magnets
are used at
recycling plants
to separate the
magnetic objects
from the
non-magnetic
objects.
Magnets
•
You can separate solid particles of different sizes by sieving.
•
A sieve is a shallow container with holes.
•
The smaller particles can pass through these holes, but the
larger ones get trapped in the sieve.
Sieving
•
Sieving can
be used to
separate
pebbles
from sand
or lumps
from flour.
Sieving
•
Filtering can be used
to separate tiny solid
particles from a
liquid.
•
The filter has tiny
pores. The liquid can
flow through these
pores, but the solid
particles cannot.
•
A coffee filter
separates coffee
grinds from coffee.
Filtering
•
Drinking water
is filtered
before it
reaches our
taps.
•
Impurities are
separated from
the water,
making it
suitable for
drinking.
Filtering
•
Some people like
to filter their tap
water even
more, using a
filter jug.
•
The filter is
found inside the
container in the
jug.
•
It has to be
changed
regularly.
Filtering
•
Evaporation can be
used to separate a
mixture containing
a solid substance
dissolved in water
(a solution).
•
The mixture is
heated until all of
the liquid has
evaporated and the
solid substance is
left behind.
Evaporation
evaporation
heat
solution
•
Evaporation occurs
widely in nature.
•
For example,
saltwater dries
under the heat of
the sun.
•
The water
evaporates, but the
salt gets left behind.
Evaporation
•
With the help of an
adult, you could carry
out an experiment to
separate a saltwater
solution.
•
When the saltwater is
heated to boiling point,
you will see the water
evaporate as steam.
•
When all of the water
has evaporated, the
salt will be left behind.
Separating solutions
•
Knowledge of
separating mixtures is
used widely in
environmental science.
•
Pollution and
impurities can be
separated from the
water in rivers, lakes
and oceans.
•
This makes them safer
for birds, aquatic
animals and humans.
Separating mixtures
•
Shutterstock
•
Beehive
Illustrations
A mixture is a combination of ingredients that can be separated by various methods like sieving, filtering, and evaporation. Magnets are also used to separate magnetic objects. Sieving separates solid particles by size, while filtering separates tiny particles from liquids. Evaporation is used for separating solid substances dissolved in water. Learn more about mixtures and how to separate them effectively.
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Presentation Transcript
Mixtures A mixture is a combination of ingredients. The individual ingredients in a mixture are not permanently changed. They are just mixed together. They can be separated again.
Separating mixtures The method of separation will depend on the size of the ingredients or particles in the mixture. We can separate some mixtures by sieving or filtering. If the mixture is a solution, we can separate it using evaporation.
Magnets Magnets can also be used to separate some mixtures. Huge magnets are used at recycling plants to separate the magnetic objects from the non-magnetic objects.
Sieving You can separate solid particles of different sizes by sieving. A sieve is a shallow container with holes. The smaller particles can pass through these holes, but the larger ones get trapped in the sieve.
Sieving Sieving can be used to separate pebbles from sand or lumps from flour.
Filtering Filtering can be used to separate tiny solid particles from a liquid. The filter has tiny pores. The liquid can flow through these pores, but the solid particles cannot. A coffee filter separates coffee grinds from coffee.
Filtering Drinking water is filtered before it reaches our taps. Impurities are separated from the water, making it suitable for drinking.
Filtering Some people like to filter their tap water even more, using a filter jug. The filter is found inside the container in the jug. It has to be changed regularly.
Evaporation Evaporation can be used to separate a mixture containing a solid substance dissolved in water (a solution). The mixture is heated until all of the liquid has evaporated and the solid substance is left behind. evaporation solution heat
Evaporation Evaporation occurs widely in nature. For example, saltwater dries under the heat of the sun. The water evaporates, but the salt gets left behind.
Separating solutions With the help of an adult, you could carry out an experiment to separate a saltwater solution. When the saltwater is heated to boiling point, you will see the water evaporate as steam. When all of the water has evaporated, the salt will be left behind.
Separating mixtures Knowledge of separating mixtures is used widely in environmental science. Pollution and impurities can be separated from the water in rivers, lakes and oceans. This makes them safer for birds, aquatic animals and humans.
Illustrations Shutterstock Beehive
